Grinding tool



F. SCHIMMEL.

GRINDING TOOL.

FILED MAY 31 I92! Jan. 23, 1923.

Patented Jan. 23, 1923.

UNITED STATES PATENT OFFICE.

FRIDOLIN SCHIMMEL, OF FARIBAUL'I, MINNESOTA.

GRINDING TOOL.

Application filed May 31,

To all /mm if only concern.

Be it known that I, FRInoLiN SoinMMEL, a citizen of the United States, residing at l aribault, in the county of Rice and State of Minnesota, have invented certain new and useful Improvements in Grinding Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention provides an improved grinding tool particularly designed and especially adapted for use in grinding the blades of cutter heads of the character described and claimed in my pending application entitled (hitter head For wood-working machines and filed of even date herewith.

The grinding tool is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a side elevation of the tool;

Fig. 2 is a front elevation thereof showing the tool positioned for action on a cutter head of the character indicated: and

Fig. 3 is a fragmentary elevation showing the manner in which one of the guide blades is secured to the bearing head of the grinding tool.

The several parts of the cutter head illustrated in Fig. 2 are designated by the same numerals that are applied thereto in said companion application and, briefly noted, are as follows:

The approximately cylindrical body 3, has spiral longitudinally extended clamp channels 5 and intervening spiral ribs 3*. Knives 6 are clamped in position by wedgeshaped clamping blocks 7 secured to the body 3 by screws The ribs 3. adjacent to the cutting edges of the cutting blades have spiral gr oves 9 with shoulders that extend parallel to the spirally bent edges of the cutter blades 6.

The grinding tool comprises a bearing head, which. as shown. is made up of two parts 10 and 11 detachably secured together by screws 12. Rigidly secured to the member 11 is an extended handle 13, by whichthe grinding tool may be held in position and moved.

Rotatively mounted in the head 10-11 is a spindle 14., preferably driven through a 1921. Serial N0. 478,682.

flexible shaft 15 and rovided at its projecting end with a grinding wheel 16.

One side of the member 10 is beveled at 1'7 and, seated against this beveled surface, is a guide blade 18. At its other end, the member 10 is provided with an extended flange, the edge of which is formed with a surface 19 that converges downwardly in respect to the beveled surface 17, forming an angle thereto of approximately ninety degrees. A guide blade 20 is secured to the beveled surface 19. The guide blades 18 and 20 are secured to the member 10, respectively, by screws 21 and 22 that work through slots 18 and 20, respectively, in said guide blades. The said slots permit the guide blades to be adjusted in the planes in which they are located so as to vary their projection below the grinding wheel 16. The guide blade 18. at its lower edge, is rabbeted or formed with a. guide flange 18, and said blades 18 and 20, in line with the bearing head 10-11, are cut away to afford clearance, leaving the projecting portions of the blade in line with and somewhat on both sides of the plane of the wheel 16, as operative guides when the tool is applied, as shown in Fig. 2. By reference to Fig. 2, it will be noted that when the grinder is applied to the cutter head with its wheel in position to sharpen a blade 6 thereof, the guiding edge of the blade 20 will rest on one of the flanges 3 of the cutter head, while the edge of the guide blade 18 will rest on another of said flanges 3 and its guide flange 18 will engage with the shoulder of the adjacent guide groove 9. In this way, the grinder is supported by blades resting on two of the ribs 3*, one of which latter is on each side of the blade 6 that is being sharpened. Bv proper adjustments of the guide blades, the grinding wheel will be set for ust the proper action on the edge of the cutter blade, both in respect to the distance that the grinding wheel will be set to run from the cutter head and the angle at which it will bevel the cutting edge of the blade. When the tool is set as shown in Fig. F.- and is then moved longitudinally of the cutter head, keeping the flange 18 engaged with the spiral shoulder of the cooperating guide groove 9, the grinding wheel will be all of the time kept in its proper operative position on the blade. Thus, the blades of the cutter heads of the character above indicated may be very quickly and accurately lll ground. The tool is therefore not only simple but highly etiieient for the purposes had in view and a great luhm' saver.

What 1 rlaim is:

l. A grinding tool of the kind described emnprisingr a hearing head. a. spindle rotatuhly mounted in said head. downwardly converging: guide blades secured to the bearing head one on each side of the spindle and extending parallel thereto. and a, grinding wheel on the spindle that Works between the guide lilndes in aplane that intersects the planes thereoi each of said guide blades being arranged to engage n cutter head on either side of knife held therein and outward of each side of the grinding wheel. at least one of the guide blades being adjustable to (iii-(Luge. the angle between interseeting tangential lines that extend from the periphery of the grinding Wheel to the lower edges of the guide hlades.

2. The strueture defined in rlaim 1 in which at least one of the guide blades is angnla'rly adjustable transversely of a. radial. line. projected from the axis of the grinding wheel.

3. The structure defined in elaim 1 in which one of the guide blades is provided With it rabhet adapted to follow a. shoulder guide groove in the cutter head for guiding the grinding Wheel for axial travelling movement over the knife.

In testimony whereof I am); my signature.

FRIDOLIN SCI'HMMEL. 

